Fix: use libgl1 instead of deprecated libgl1-mesa-glx

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Co-Authored-By: Claude <noreply@anthropic.com>

Dockerfile

@@ -5,7 +5,7 @@ WORKDIR /app
 # Install system dependencies for Docling and OCR
 RUN apt-get update && apt-get install -y --no-install-recommends \
     build-essential \
-    libgl1-mesa-glx \
+    libgl1 \
     libglib2.0-0 \
     libsm6 \
     libxext6 \